A8510 データシートの表示（PDF） - Allegro MicroSystems

部品番号

コンポーネント説明

一致するリスト

A8510

Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

Allegro MicroSystems 

A8510

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

Pin-out Diagram

VIN 1

FAULT 2

NC 3

COMP 4

APWM 5

EN/PWM 6

FSET/SYNC 7

PAD

21 PGND

20 PGND

19 VDD

18 LED1

17 LED2

16 LED3

15 LED4

Terminal List Table

Number

Name

Function

1

VIN

Input power to the A8510 as well as the positive input used for the current sense resistor.

This pin is used to indicate a fault condition, it is an open drain type configuration that will be pulled

2

¯F¯¯A¯U¯¯L¯¯T¯ low when a fault occurs; connect a 100 kΩ resistor between this pin and the required logic level

voltage.

3, 9

NC

No connect.

4

COMP

Output of the error amplifier and compensation node; connect a series RZCZ network from this pin to

GND for control loop compensation.

5

APWM

Analog trimming option or dimming; applying a digital PWM signal to this pin adjusts the internal ISET

current.

6

EN/PWM

PWM dimming pin used to control the LED intensity by using pulse width modulation, with the typical

PWM dimming frequency is in the range of 200 Hz to 1 kHz; also used to enable the A8510.

Frequency/synchronization pin; connect a resistor RFSET from this pin to GND to set the switching

7

FSET/SYNC frequency. This pin can also be used to synchronize two or more converters in the system; the

maximum synchronization frequency is 2.3 MHz.

8

10 to

18

ISET

LED8 to

LED1

Connect the RISET resistor between this pin and GND to set the LED 100% current level.

Connect the cathode of each LED string to these pins.

19

VDD

Output of internal LDO; connect a 0.1 μF decoupling capacitor between this pin and GND.

20, 21

PGND Power ground for internal NMOS device.

22

OVP

This pin is used to sense an overvoltage condition; connect the ROVP resistor from VOUT to this pin to

adjust the Overvoltage Protection (OVP) function.

23, 24

SW

The drain of the internal NMOS switch of the boost converter.

25

VGATE Gate driver pin for external P-MOSFET disconnect switch.

26

VSENSE

Connect this pin to the negative sense side of the current sense resistor RSC; the threshold voltage

is measured as VIN – VSENSE.

–

PAD

Exposed pad of the package providing enhanced thermal dissipation; this pad must be connected to

the ground plane(s) of the PCB with at least 8 thermal vias, directly in the pad.

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Share Link: